sensibility vs sensitiveness

sensibility and sensitiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
sensibility	Yes	No	No	No
sensitiveness	Yes	No	No	No

As nouns, sensibility and sensitiveness are synonyms defined as:

sensibility and sensitiveness: (physiology) responsiveness to external stimuli; the faculty of sensation

Other synonyms of sensibility include sensitivity.

As nouns, sensitiveness is a hypernym of sensibility; that is, sensitiveness is a word with a broader meaning than sensibility:

Other hypernyms of sensibility include sensitivity.

sensibility (noun)	sensitiveness (noun)
mental responsiveness and awareness	the ability to respond to physical stimuli or to register small physical amounts or differences
(physiology) responsiveness to external stimuli; the faculty of sensation	the ability to respond to affective changes in your interpersonal environment
refined sensitivity to pleasurable or painful impressions	(physiology) responsiveness to external stimuli; the faculty of sensation
	sensitivity to emotional feelings (of self and others)